@acid2come - I assume it was the gastroenterologist who did all this testing and advised you to keep taking the same medicine? Do you have an internist or family doctor who you see for everything else? If so, that doctor should also be able to interpret the limited advise you got. Second- there also has to be a reason why you have difficulty breathing. Could very well be asthma- possibly worse if you have acid reflux. Your oxygen could be normal and you still can have difficulty breathing.
I have been followed by a pulmonologist for years- on and off bad asthma. They perform pulmonary function tests whenever I visit.
It is helpful to have one “ doctor home” so to say- they can help coordinate your care too.
Please have your breathing evaluated!